Redalyc.IMPLICATION for in Situ CONSERVATION of INDIGENOUS SPECIES with SPECIAL REFERENCE to WILD Coffea Arabica L. POPULATION I
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Tropical and Subtropical Agroecosystems E-ISSN: 1870-0462 [email protected] Universidad Autónoma de Yucatán México Githae, Eunice W.; Gachene, Charles K. K.; Odee, David W. IMPLICATION FOR in situ CONSERVATION OF INDIGENOUS SPECIES WITH SPECIAL REFERENCE TO WILD Coffea arabica L. POPULATION IN MOUNT MARSABIT FOREST, KENYA Tropical and Subtropical Agroecosystems, vol. 14, núm. 2, mayo-agosto, 2011, pp. 715-722 Universidad Autónoma de Yucatán Mérida, Yucatán, México Available in: http://www.redalyc.org/articulo.oa?id=93918231036 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Tropical and Subtropical Agroecosystems, 14 (2011): 715 - 722 IMPLICATION FOR in situ CONSERVATION OF INDIGENOUS SPECIES WITH SPECIAL REFERENCE TO WILD Coffea arabica L. POPULATION IN MOUNT MARSABIT FOREST, KENYA [IMPLICACIONES PARA LA CONSERVACIÓN in situ DE ESPECIES INDIGÉNAS CON ESPECIAL REFERENCIA A LA POBLACIÓN SILVESTRE DE Coffea arabica L. EN EL BOSQUE DE LA MONTAÑA MARSABIT, KENYA] Eunice W. Githae1*, Charles K. K. Gachene1 and David W. Odee2 1Department of Land Resource Management and Agricultural Technology, University of Nairobi, P. O. Box 29053-00625, Nairobi, Kenya, 2Drylands Research Programme, Kenya Forestry Research Institute (KEFRI), P. O. Box 20412-00200, Nairobi, Kenya, E-mail: [email protected]; Tel.: +254 725 286 095 *Corresponding Author SUMMARY RESUMEN Mt. Marsabit forest is the only forest in Kenya where El bosque de la montaña Marsabit es el único bosque Coffea arabica L. (Rubiaceae) occurs naturally in wild de Kenia donde se encuentran población silvestres de populations. This forest however is highly fragmented Coffea arabica L. (Rubiaceae) de manera natural. Este and decreasing at a rapid rate due to anthropogenic bosque se encuentra en un proceso rápida reducción y activities. This study assesses the diversity and fragmentación debido a actividades antropogénicas. Se structure of species of conservation concern with evaluó la diversidad y estructura de especies de interés reference to wild coffee as basis for management, para su conservación con referencias al café silvestre conservation and use of wild genetic resources in como una base para el manejo, conservación y Kenya. A botanical inventory and diversity study aprovechamiento de recursos genéticos en Kenia. Se identified 52 species of trees and shrubs, 12 species of realizó un inventario y se identificaron 52 especies de herbs and six species of climbers and lianas were árboles y arbustivas, 12 de herbáceas y 6 de trepadoras recorded and belonged to 35 families and 64 genera. y lianas pertenecientes a 35 familias y 64 géneros. Rubiaceae (Coffee family) was the richest family with Rubiaceae (familia del café) fue la familia con mayor nine species followed by Euphorbiaceae with six riqueza (9 especies) seguido de Euphorbiaceae (6 species. Rinorea convallarioides (Bak.f.) Eyles ssp. especies). Rinorea convallarioides (Bak.f.) Eyles ssp. marsabitensis Grey-Wilson (Violaceae), an endemic marsabitensis Grey-Wilson (Violaceae), una especie species, and Drypetes gerrardii Hutch. endémica, y Drypetes gerrardii Hutch. (Euphorbiaceae), were the two most important species, (Euphorbiaceae), fueron las dos especies más accounting for more than third of the combined importantes y representaron más de un tercio del valor importance value. Coffea arabica was dominant in the combinado de importancia. Coffea arabica fue forest undergrowth with a higher density occurring in dominante bajo el dosel del bosque, con una mayor the open patches where it was competing with other densidad en las áreas abiertas donde competía con shrubs and small trees in the undergrowth. The success otras especies de arbustivas y árboles pequeños en and future management and conservation strategy of crecimiento. El éxito, manejo futuro y estrategia de this forest depend on how to conserve the forest conservación de este bosque dependerá de cómo genetic resources especially of this wild species. conservar los recursos genéticos, en especial las especies silvestres. Key words: Conservation; Coffea Arabica; Mt. Marsabit forest Palabras clave: Conservación; Coffea Arabica; Bosque de montaña. INTRODUCTION capacity is often limited (Gordon and Newton, 2006). This tool is able to distinguish between sites not only Biodiversity inventory as a tool for guiding by number of species (richness), but also by number of conservation planning at a local scale is under utilized, threatened species. Quantitative inventories provide especially in tropical countries where technical vital information for identifying economically useful 715 Githae et al., 2011 plants as well as rare, threatened or vulnerable species, MATERIALS AND METHODS which may require urgent conservation (e.g. Ssegawa and Nkuutu, 2006). Conserving species of special Study site interest in tropical forest ecosystems ensures that the vital socio-economic and environmental services (e.g. The study was conducted within Mt. Marsabit forest in wood and non-wood products, and soil and water Marsabit district in the Eastern Province of Kenya, conservation) are sustained for the livelihoods of the which lies between latitude 245' N and 47' N and dependent or adjacent communities. However, many longitude 3757' E and 3921' E. Mt. Marsabit forest forests in the tropics currently face a variety of threats, covers an area of about 150 km2, and has a unique which include: unsustainable harvesting practices, floral and faunal biodiversity (Beentje, 1994; Adano, illegal encroachment, poor management, as well as 2002). The forest is located on an extinct Holocene degradation by the dependent communities (United shield volcano with an old crater, Lake Paradise Nations Development Programme [UNDP], 2006). (Monr, 1962). It is a sub-humid cloud-montane forest of several hills surrounded at lower altitudes by arid Coffea arabica originates from southwest and south and semi arid areas, and is isolated from the other dry Ethiopia, where it occurs naturally in the undergrowth zone forests of Samburu and Marsabit districts of the montane rainforests between 1,000 and 2,000 (Adano, 2002). It has an elevation of about 1700 m m-asl (Schmitt et al., 2005). Other places where it is above sea level (m asl) with a mean maximum found outside Ethiopia is Mt. Marsabit in northern temperature of 26-28C and a mean minimum Kenya and Mt. Boma in southeast Sudan. However, temperature of 14-16C. The mean annual rainfall is these areas and the respective coffee populations have 800-1400 mm while the mean annual evaporation rate not been sufficiently investigated (Gole, 2003). This is 1450-2200 mm (Sombroek et al., 1982). It has rich study highlights the occurrence and distribution of volcanic soils, which are well developed with high species with conservation significance together with water retention capacity (GOK, 1996). wild coffee in Mt. Marsabit forest. Mt Marsabit is an ecologically and socio-economically important Forest sampling, measurement and species ecosystem, located in Marsabit National Reserve. The identification reserve was established by the Kenya Government Notice 936 in 1948 (Synott, 1979) and is the only Three belt transects of 18 × 1.2 km, 12 × 1.2 km and 5 government gazetted forest in Marsabit district × 1 km were laid in three parts of Mt. Marsabit forest (Government of Kenya [GOK], 1996). The forested representative of the vegetation. They were subdivided mountain is surrounded by a vast area of open dryland into 400 × 400 m quadrats, which were further savanna thus attracting a variety of wildlife and is the subdivided into plots of 20 × 5 m. Sampling, only source of permanent surface water in the region. assessments and measurements were carried out on Communities living around the forest utilize it for fuel randomly distributed plots among the quadrats. wood, timber and medicinal plants. They also obtain Eighty-one plots were sampled in the first transect, 61 all their water from the wells and springs fed by the in the second and twelve in the third transect giving a forest. Wild Coffea arabica is among the species of total of 154 sampled plots. In each plot, all trees and conservation concern in this forest. The highly diverse shrubs (≥5 cm dbh), herbs, climbers and lianas were gene pool of these wild coffee populations is of identified and enumerated. The number of individuals international importance, because it constitutes an of each tree and shrub species were counted and important potential for the breeding of new varieties. recorded. The cover of five vegetation layers: Mt. Marsabit forest therefore has a high potential for emergent (trees above 25 m high), overstorey (trees genetic resources and needs to be preserved as a ranging between 9-24.9 m high), understorey (young crucial water catchment and unique biodiversity trees and shrubs ranging 2-8.9 m high), shrub/ saplings refugia in the surrounding harsh arid environment. The (ranging 1-1.9 m high) and herb/seedling layer (<one aim of this study was to undertake a vegetation meter high) were estimated. Environmental parameters inventory and identify the structure of wild coffee and such as slope and altitude were recorded. Voucher other associated species in Mt. Marsabit forest for the specimens were collected in duplicate for purpose of conservation of genetic resources and identification